This seller was misdirected
by an antique dealer who said these are 10th Mountain Division mittens
but they are not, nor are they even U.S. Army mittens. They are British
army mittens!
They
were
made in
Milborne
Port, a town on the south coast of England in 1941, long before the
British were making G. I. gear. These mittens were probably imported
and sold
at surplus stores as they appear on the internet and at militaria shows
every now and then.

In 1941, the U.S. Army had just developed
their first ski mittens. They were entirely
leather with an opening in the palm for the trigger finger. By the
time the 10th Mountain Division appeared, leather ski mittens were
obsolete and the standard ski mitten was the Army's poplin trigger-finger
mitten with the leather palm.